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000902432 1001_ $$0P:(DE-HGF)0$$aHolz, S.$$b0
000902432 245__ $$aTowards an improved understanding of ${\eta \rightarrow \gamma ^*\gamma ^*}$
000902432 260__ $$aHeidelberg$$bSpringer$$c2021
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000902432 520__ $$aWe argue that high-quality data on the reaction e+e−→π+π−η will allow one to determine the doubly-virtual form factor η→γ∗γ∗ in a model-independent way with controlled accuracy. This is an important step towards a reliable evaluation of the hadronic light-by-light scattering contribution to the anomalous magnetic moment of the muon. When analyzing the existing data for e+e−→π+π−η for total energies squared k2>1GeV2, we demonstrate that the effect of the a2 meson provides a natural breaking mechanism for the commonly employed factorization ansatz in the doubly-virtual form factor Fηγ∗γ∗(q2,k2). However, better data are needed to draw firm conclusions.
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000902432 7001_ $$0P:(DE-HGF)0$$aPlenter, J.$$b1
000902432 7001_ $$0P:(DE-Juel1)165748$$aXiao, C. W.$$b2
000902432 7001_ $$0P:(DE-HGF)0$$aDato, T.$$b3
000902432 7001_ $$0P:(DE-Juel1)131182$$aHanhart, Christoph$$b4
000902432 7001_ $$0P:(DE-HGF)0$$aKubis, B.$$b5$$eCorresponding author
000902432 7001_ $$0P:(DE-Juel1)131252$$aMeißner, U.-G.$$b6
000902432 7001_ $$0P:(DE-Juel1)131377$$aWirzba, A.$$b7
000902432 773__ $$0PERI:(DE-600)1459069-4$$a10.1140/epjc/s10052-021-09661-0$$gVol. 81, no. 11, p. 1002$$n11$$p1002$$tThe European physical journal / C$$v81$$x1434-6044$$y2021
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